Abstract: The present invention relates to method for obtaining traffic information by the use means of optical signals between a vehicle and an optical communication node, wherein the node forms part of a road network. According to the present invention there is provided a method comprising a first method for detecting a vehicle using a first light detector and first light source associated with the node, wherein the first detection method comprises the steps of: a light signal being transmitted by the first light source; this light signal being detected by the first light detector; characterized by causing the light signal transmitted by the first light source to be reflected on the underside of the vehicle, measuring this reflected light with the first light detector and determining a presence status subject to this measurement. The present invention also provides an optical communication assembly and system for implementing the method.

Abstract: The present invention relates to method for obtaining traffic information by means of optical signals between a vehicle and an optical communication node, wherein the node forms part of a road network. According to the present invention there is provided a method comprising a first method for detecting a vehicle using a first light detector and first light source associated with the node, wherein the first detection method comprises the steps of: a light signal being transmitted by the first light source; this light signal being detected by the first light detector; characterized by causing the light signal transmitted by the first light source to be reflected on the underside of the vehicle, measuring this reflected light with the first light detector and determining a presence status subject to this measurement. The present invention also provides an optical communication assembly and system for implementing the method.